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Sun, 27 Sep 2026 23:26:01 +0000 Received: from offworld (unknown [172.58.116.59]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dave@stgolabs.net) by pdx1-sub0-mail-a257.dreamhost.com (Postfix) with ESMTPSA id 4htLCm1y6Zz103W; Sun, 27 Sep 2026 16:25:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=stgolabs.net; s=dreamhost; t=1790551559; bh=2aSMKRCkja4n/VQgEqybQKvbi5xmjbGNpO1qSHqKYOE=; h=Date:From:To:Cc:Subject:Content-Type; b=E+D62Z35SRdU9cbMZcyXmBaunm2mvKP6J/oet/VsA6QZtvpQwYiEdMZMRoUyLl9Pz uGITOgk2tDjNSsp9tdRkBGg4y2L7K+YFz1cXx3R0R9pMihP53UfFaKg3JZ9g/WjnXY bcTgNtyFfYThp8vCi3wl7ZJVW/h4izJx6J0VkjOEFQz7dopOc4zhI+v6skKcKCaXDS RyKMidAKbn/kGxoRSsNIEfysltrVy52mlJg/87pJOEKLXJbqVrGOiBRj0uIyPfsowV MjgaZdMkHoRckeINWirahjclE9pC4kxzb+4eiVSZc0QEEgVNK4fFw9risHFiKtRpR7 77xkxd7s/yiyw== Date: Sun, 27 Sep 2026 16:25:52 -0700 From: Davidlohr Bueso To: Bharata B Rao Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Jonathan.Cameron@huawei.com, dave.hansen@intel.com, gourry@gourry.net, mgorman@techsingularity.net, mingo@redhat.com, peterz@infradead.org, raghavendra.kt@amd.com, riel@surriel.com, rientjes@google.com, sj@kernel.org, weixugc@google.com, willy@infradead.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, nifan.cxl@gmail.com, xuezhengchu@huawei.com, yiannis@zptcorp.com, akpm@linux-foundation.org, david@kernel.org, byungchul@sk.com, kinseyho@google.com, joshua.hahnjy@gmail.com, yuanchu@google.com, balbirs@nvidia.com, alok.rathore@samsung.com, shivankg@amd.com, donettom@linux.ibm.com Subject: Re: [PATCH v8 3/8] mm: Hot page tracking and promotion - pghot Message-ID: <20260927232552.u6iypdeadjf4nyla@offworld> References: <20260728054356.291998-1-bharata@amd.com> <20260728054356.291998-4-bharata@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20260728054356.291998-4-bharata@amd.com> User-Agent: NeoMutt/20220429 X-Rspam-User: X-Stat-Signature: nrysxix7ajooaekjso4gm53jogpe7fb7 X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: D9D2520004 X-HE-Tag: 1790551562-552244 X-HE-Meta: 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 IVGIWnbv FRddHY1q46UdmWckoJQfxy2AOlwNT5bsPjT9OEqv+fVK/83GRfJKg7na77EFtFmrN2nEWSamCJJM+Vp8zUWvpwFT6s79pz1v5QonxbKjql6LNGJhrsYktqSSxsm3DIzM1axgCwMW5KyltuBNWhrkHTWvsJ0Pl5D/90hZAKVvUEVlO+ekctNSBZCmnbNz5AuCn9NvIqj3un1rcuWXFKUgMWlIk2CHIYCVEwrDPO0yUzmRSGZ0TElHoQIsls7HoCmQpfak9N6Y2FzBlqMTt+/BwMDrV0tstTBRvM0GIE7VqpeDr/O5XjR9MTR+GLiSUDfpzvrVwY1MGbt1mt5CDa9GgpE+/IlqbwTqfBgPVFIbZMqr4ZNojRswSJoIEyg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 28 Jul 2026, Bharata B Rao wrote: >+/** >+ * pghot_record_access() - Record page accesses from lower tier memory >+ * for the purpose of tracking page hotness and subsequent promotion. >+ * >+ * @pfn: PFN of the page >+ * @nid: Unused >+ * @src: The identifier of the sub-system that reports the access >+ * @now: Access time in jiffies >+ * >+ * Updates the frequency and time of access and marks the page as >+ * ready for migration if the frequency crosses a threshold. The pages >+ * marked for migration are migrated by kmigrated kernel thread. >+ * >+ * Return: 0 on success and -EINVAL on failure to record the access. >+ */ >+int pghot_record_access(unsigned long pfn, int nid, int src, unsigned long now) >+{ [...] >+} This needs a EXPORT_SYMBOL_GPL(pghot_record_access) for any module based sources. Thanks, Davidlohr